How is your setup wired? Is there HDMI between the cable/satellite box and the TV? If so, look into disabling Consumer Electronics Control (CEC) on the cable/satellite box or the TV. However note that different TV manufacturers call "CEC" different things:
"Trade names for CEC are Anynet+ (Samsung), Aquos Link (Sharp), BRAVIA Link and BRAVIA Sync (Sony), HDMI-CEC (Hitachi), E-link (AOC), Kuro Link (Pioneer), CE-Link and Regza Link (Toshiba), RIHD (Remote Interactive over HDMI) (Onkyo), RuncoLink (Runco International), SimpLink (LG), T-Link (ITT), HDAVI Control, EZ-Sync, VIERA Link (Panasonic), EasyLink (Philips), and NetCommand for HDMI (Mitsubishi)."
From the CEC section in Wikipedia's article about HDMI.